A May 18 wedding is being planned by Kristi Costa of North Washington and Adam Wilson of Chicora. The bride-to-be is the daughter of John and Pam Costa of North Washington.Parents of the prospective bridegroom are Mark and Melissa Wilson of Chicora. The bride-elect is a 2006 graduate of Moniteau High School and a 2008 graduate of Butler County Community College. She is employed by Penn United Technologies in Cabot. Her fiancÚ graduated in 2006 from Karns City High School. He is employed by Harsco in Butler.